or reply to someone else's comment, quoting the list of ingredients already in that comment and adding one more,

or reply to someone else's comment with an idea for a recipe using the ingredients in the comment you're replying to. You can assume that in addition to those ingredients you also have things like flour, oil, water, salt and pepper, standard dried herbs, vinegar, etc. No hard rules on this one, just be reasonable.

I can't stop you from adding ridiculous ingredients, but you probably won't get any followups if you do. You can play as many times and in as many branches as you like.